Finding the Fourth Proportional to 3,608.31, 4,978.74 and 2,116.71

Step by Step Solution

1. Step 1: Write the proportion equation
   3,608.31 : 4,978.74 = 2,116.71 : x
2. Step 2: Convert to fraction form
   3,608.31/4,978.74 = 2,116.71/x
3. Step 3: Cross multiply
   3,608.31x = 4,978.74 × 2,116.71
4. Step 4: Simplify right side
   3,608.31x = 10,538,548.75
5. Step 5: Solve for x
   x = 10,538,548.75/3,608.31
6. Step 6: Final answer
   x = 2,920.63